Estimation of Operational Serviceability of Constructions with Regard to the Faults Arising During Erection

Presented are results of a research into the elaboration of the general method for numeric modelling of the stress-deformation state of reinforced concrete constructions during prolonged operating stresses and exposures. The method is presented in the form of an algorithm on the basis of which computer software has been developed for estimating reinforced concrete constructions operating in a difficult environment. For the numeric solution of the plane problem a method of terminal elements was used; this method employed the displacement pattern. In recording the defining relations taken into account were the main factors of the physical non-linearity of reinforced concrete, i.e. the acquired orthotropy of the concrete at an operating stage prior to formation of cracks in the concrete, crazing and development of plastic deformations in the reinforcement. Considered, by way of example of the numeric realization of the method, is an estimation of pre-stressed reinforced beam experimentally studied by other authors. The choice for the estimation of this construction was determined by the fact that in the course of investigations the functional dependencies of the rheological properties of the concrete were experimentally established in the required amount, including those in the area of non-linear deformations. The results obtained in the estimation tallied well with the theoretical data as well as with those produced using the proposed method and experimental ones.